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Domain Controller Roles

 
A domain controller is a server that is running a version of the Microsoft Windows Server 2003 or Windows 2000 Server operating system and has the Active Directory directory service installed.

Note

• Implementations of the Microsoft Windows NT 3.51 and Microsoft Windows NT 4.0 operating systems also have domain controllers, but they do not support Active Directory.

When you install Windows Server 2003 or Windows 2000 Server on a computer, you can choose to configure a specific server role for that computer. When you want to create a new forest, a new domain, or an additional domain controller in an existing domain, you configure the server with the role of domain controller by installing Active Directory.

By default, a domain controller stores one domain directory partition consisting of information about the domain in which it is located, plus the schema and configuration directory partitions for the entire forest. A Windows Server 2003 domain controller can also store one or more application directory partitions. There are also specialized domain controller roles that perform specific functions in an Active Directory environment. These specialized roles include global catalog servers and operations masters.

Global Catalog Servers

Every domain controller stores the objects for the domain in which it is installed. However, a domain controller designated as a global catalog server stores the objects from all domains in the forest. For each object that is not in the domain for which the global catalog server is authoritative as a domain controller, a limited set of attributes is stored in a partial replica of the domain. Therefore, a global catalog server stores its own full, writable domain replica (all objects and all attributes) plus a partial, read-only replica of every other domain in the forest. The global catalog is built and updated automatically by the Active Directory replication system. The object attributes that are replicated to global catalog servers are the attributes that are most likely to be used to search for the object in Active Directory. The attributes that are replicated to the global catalog are identified in the schema as the partial attribute set (PAS) and are defined by Microsoft. However, to optimize searching, you can edit the schema by adding or removing attributes that are stored in the global catalog.

The global catalog makes it possible for clients to search Active Directory without having to be referred from server to server until a domain controller that has the domain directory partition storing the requested object is found. By default, Active Directory searches are directed to global catalog servers.

The first domain controller in a forest is automatically created as a global catalog server. Thereafter, you can designate other domain controllers to be global catalog servers if they are needed.

Operations Masters

Domain controllers that hold operations master roles are designated to perform specific tasks to ensure consistency and to eliminate the potential for conflicting entries in the Active Directory database. Active Directory defines five operations master roles: the schema master, domain naming master, relative identifier (RID) master, primary domain controller (PDC) emulator, and infrastructure master.

The following operations masters perform operations that must occur on only one domain controller in the forest:

• Schema master
• Domain naming master

The following operations masters perform operations that must occur on only one domain controller in the domain:

• Primary Domain Controller (PDC) emulator
• Infrastructure master
• Relative ID (RID) master

 

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MCSE :

Configure and troubleshoot accessibility services.

The following setting can be accessed from the Control Panel under Accessibility Options.

StickyKeys , which allows you to press the CTRL, ALT, SHIFT, or Windows logo keys and have them remain active until the next time you press a key other than CTRL, ALT, SHIFT, or Windows logo keys. This is useful for people who have difficulty pressing two keys simultaneously.

FilterKeys , which instructs your keyboard to ignore brief or repeated keystrokes. You can also adjust the keyboard repeat rate, which is the rate at which a key repeats when you hold it down.

ToggleKeys, the computer will play a high-pitched sound when the CAPS LOCK, SCROLL LOCK, or NUM LOCK keys are switched on and a low-pitched sound when any of those keys are switched off.

SoundSentry, tells the computer to flash part of your screen every time the system's built-in speaker plays a sound. You can specify which part of the screen flashes by clicking Settings.

ShowSounds, which instructs programs that usually convey information only by sound also to provide all information visually, such as by displaying text captions or informative icons.

High Contrast, Instructs programs to change the color scheme to the one specified in the Settings dialog box instead of using program-specific colors and to increase legibility whenever possible.

MouseKeys, enables you to use the numeric keypad to move the mouse pointer and to click, double-click, and drag.

Utility Manager enables users to check an Accessibility program's status, and start or stop an Accessibility program. Programs accessible from the Utility Manager are Magnifier, Narrator, and On-Screen Keyboard.

Utility Manager, can be accessed from Start | Programs | Accessories | Accessibility, and then click Utility Manager. Or use the Windows Logo key + U shortcut keys.

Narrator is a text-to-speech utility for users who are blind or have low vision. It is designed to work with Notepad, Wordpad, Control Panel programs, Internet Explorer, Windows 2000 desktop, and Windows 2000 setup. It reads what is displayed on your screen ie: The contents of the active window, menu options, and text you have typed.

Magnifier is a display utility that makes the screen more readable for users who have low vision. Magnifier creates a separate window that displays a magnified portion of your screen.

On-Screen Keyboard is a utility that displays a virtual keyboard on your screen and allows users with mobility impairments to type data using a pointing device or joystick.

 

 


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